Performance Evaluation of Modified Cement-Sodium Silicate Grouting Material for Prereinforcing Loose Deposit Tunnels
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 7
Abstract
In grouting practices for tunneling in loose deposits, the traditional grouting materials often suffer from its disadvantages, such as prolonged gel times, poor stability, an uncontrollable range of diffusion, and large grout consumption. In this study, an organic–inorganic hybrid chemical grouting material based on polymerization of hydrogen double bonds, Ca-C connection and excellent synergistic interactions among cement, polyethylene glycol (PEG) 200, sodium silicate, and polycarboxylate superplasticizer (PS) was prepared with a simple process. Based on percentages of water/cement at 1, PEG200 (2%), sodium silicate (10%), and PS (0.2%), the obtained modified cement-sodium silicate grouting material (C-S-P) forms a three-dimensional network structure and results in a high stability, good pumpability, satisfactory initial compressive strength, and relatively lower permeability performance. The C-S-P was primarily composed of amorphous PEG and crystalline polysilicic composite, and its probable formation mechanism was evaluated. The proposed new grouting material was applied for reinforcing a tunnel in loose deposits, and the results illustrate that the C-S-P turns out excellent grouting performance and mechanical performance, thereby fulfilling the requirements for tunnel rapid excavation in loose deposits. This study presents the methodology for preparing a new grouting material for reinforcing loose deposits.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (No. 51608539) and the China Postdoctoral Science Foundation (Nos. 2016M592451 and 2017T100610). The corresponding author gratefully acknowledges their financial support.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 7 • July 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jun 1, 2018
Accepted: Dec 21, 2018
Published online: Apr 27, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 27, 2019
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